/*
THIS FILE IS PART OF THE >>ADRENALIN-3D-GRAFIC-ENGINE<<
for latest info visit http://www.creative-games.de

Copyright (c) 2008-2009 by Marco Schneider

This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License (LGPL) as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
License for more details.

*/

#ifndef __ADL_ADRENALIN_SINGLETON_H__
#define __ADL_ADRENALIN_SINGLETON_H__

namespace Adrenalin
{
	template<class T>
	class Singleton
	{
	protected:
		static T* _pInstance;

	protected:
		/// Constructor
		Singleton<T>(){}
		Singleton<T>(const Singleton<T>& other){}

	public:
		/// Destructor
		virtual ~Singleton<T>(){}

		///Creates an instance and returns a pointer on it
		static T* CreateInstance()
		{
			if(!_pInstance)
				return _pInstance = new T;
			return NULL; // maybe an exception here?
		}

		// Deletes the instance
		static void DeleteInstance()
		{
			if(!_pInstance)
			{
				delete _pInstance;
				_pInstance = NULL;
			}
		}

		// Returnes an instance Pointer
		static T* Instance()
		{
			if(!_pInstance) {
				return NULL;
			}
			return _pInstance;
		}

	};// Singleton
};

#endif